Topic: unable to login to iredmail

i use the same password on every step "passowrd123". So i didn't forgot my password., i can see the password in the config file. I am unable to login to iredadmin nor to roundcube, nor to ldap, i have some questions

what is the default username? postmaster@example.com? manager? or what?

note:

i didn't setup DNS record for SPF nor for for DKIM yet.i left LDAP suffix as is, should i replace dc=example with my own website?